As a minister in the Universal Life Church, I can perform marriages. It's very exciting. Here's the deal with the State of Oregon:

Officiants: Ministers of any church organized, carrying on its work, and having congregations in this state may perform marriages in this state if authorized by their church to do so. Before performing marriages, ministers must file their credentials with the county clerk of the county in which they reside or in which the marriage is to be performed. Ministers must give the bride and groom a marriage certificate upon request. Also, the minister must send a marriage certificate to the county clerk who issued the marriage license within one month after the marriage.